General Aspects — A complete, exam-focused study companion for CPL & ATPL student pilots, covering equipment lists, icing, fire, decompression, wind shear, wake turbulence, security and runway hazards.
Every box is colour-coded so your eye learns the rule before your brain does:
Every exact DGCA figure is shown like this — 240 m (800 ft) — so the precise value is never lost. Examiners test the number, not the paraphrase.
Aircraft are certified with a great deal of redundant equipment. The MEL is the document that tells the crew whether the aeroplane may legally and safely fly with a particular item unserviceable — turning a "go / no-go" judgement into a documented decision.
The operator shall include in the Operations Manual a Minimum Equipment List (MEL), approved by the DGCA, which enables the pilot-in-command to determine whether a flight may be commenced or continued from any intermediate stop should any instrument, equipment or system become inoperative.
The Master Minimum Equipment List (MMEL) defines the equipment on which certain in-flight failures can be allowed, and the conditions under which this allowance can be accepted. The MMEL is drawn up by the manufacturer and approved by the DGCA.
The relationship is a chain of authority. The manufacturer writes the master list (MMEL); the operator tailors it into its own MEL for its specific fleet and operations; and the DGCA approves both. The MEL can never be less restrictive than the MMEL.
flowchart TD
A["MANUFACTURER
drafts the MMEL
(Master Minimum Equipment List)"]:::mfr
B{"DGCA
approves MMEL"}:::reg
C["OPERATOR
creates its own MEL
(placed in the Operations Manual)"]:::op
D{"DGCA
approves the MEL"}:::reg
E["PILOT-IN-COMMAND
uses MEL to decide:
may the flight be commenced
or continued?"]:::crew
A --> B --> C --> D --> E
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classDef reg fill:#fdf3e0,stroke:#c8961e,color:#7a5708;
classDef op fill:#eaf6ee,stroke:#3c9a5a,color:#1f5232;
classDef crew fill:#fdecea,stroke:#d9534f,color:#7d211d;
The DGCA may require an operator's approved MEL to specify the operating equipment required for night and/or IMC operations, and separately for day/VMC operations. The same aircraft may therefore be despatchable for a day VMC sector but grounded for a night IMC sector with the identical defect.
MMEL = Manufacturer. MEL = found in the Operations Manual. The reference document a crew opens first when equipment fails while still parked is the MEL — not the Flight Manual, and not the "Abnormal & Emergency Procedures" chapter.
Aeroplanes shall be operated in accordance with the provisions of the Flight Manual approved by the State of Design.
An aeroplane shall be operated in compliance with the terms of its Certificate of Airworthiness and within the approved operating limitations contained in its Flight Manual. The AFM limitations are not advisory — they are legally binding boundaries.
When applying AFM performance data, the crew/operator shall take account of all factors that significantly affect the performance of the aeroplane, including but not limited to:
Ice is the silent destroyer of lift. This section covers when an aircraft may take off, how contamination is detected, the two distinct fluid procedures, and why even an invisible film of ice matters.
A flight to be planned or expected to operate in suspected or known ground icing conditions shall NOT take off unless the aeroplane has been inspected for icing and, if necessary, has been given appropriate de-icing / anti-icing treatment. Accumulation of ice or other naturally occurring contaminants shall be removed so that the aeroplane is kept in an airworthy condition prior to take-off.
(a) An operator shall not operate an aeroplane in expected or actual icing conditions unless it is certificated and equipped to operate in icing conditions.
(b) An operator shall not operate an aeroplane in expected or actual icing conditions at night unless it is equipped with a means to illuminate or detect the formation of ice. Any illumination used must be of a type that will not cause glare or reflection that would handicap crew members in the performance of their duties.
The two most common techniques for protecting an aircraft's critical surfaces are de-icing and anti-icing — they sound similar but do opposite jobs.
| Aspect | De-icing | Anti-icing |
|---|---|---|
| Purpose | Procedure by which existing frozen contamination (frost, ice, snow or slush) is removed from the aircraft. | Procedure that protects a clean surface against the accumulation of frozen contaminants for a limited period. |
| Fluid used | Heated Aircraft Deicing Fluid (ADF) — provides clean surfaces. | Aircraft Anti-Icing Fluid (AAF) — applied to a surface already free of frozen contaminants. |
| Surface state before | Surface is contaminated. | Surface is already free of frozen contamination. |
| Effect | Restores a clean surface. | Buys a limited "holdover" period of protection. |
De/anti-icing fluids are only required until the aircraft becomes airborne, after which the on-board de/anti-icing system then operates. The ground fluids are a bridge to get you safely into the air; the airframe system takes over thereafter.
A very small amount of roughness — in thickness as low as 0.40 mm (1/64 in) — caused by ice, snow or frost, disrupts the airflow over the lift and control surfaces. The consequence is severe lift loss, increased drag and impaired manoeuvrability, particularly during the take-off and initial climb phases.
Remember the instructor's rule: "There is no such thing as an insignificant amount of ice."
Accumulation of snow or ice on an aircraft in flight causes an increase in the stalling speed. It does not raise the stall angle of attack — in fact contamination makes the wing stall earlier (at a lower angle).
Ice can form even when the Outside Air Temperature (OAT) is well above 0°C (32°F). An aircraft with wing fuel tanks may carry fuel cold enough to lower the wing-skin temperature below freezing. This is cold-soaking. It also occurs after cruising at high altitude for a period followed by a quick descent into a humid environment — liquid water contacting the below-freezing wing then freezes onto it.
Cold-soaking can also be caused by fuelling an aircraft with cold fuel. With rain or high humidity present, ice can form on the cold-soaked wing and accumulate over time. This ice can be invisible to the eye and is often referred to as clear ice.
Because clear ice is hard to see, it is detected by:
Sheets of clear ice dislodged from the wing or fuselage during take-off or climb can be ingested by aft-fuselage-mounted engines, causing a flameout or damage. Dislodged sheets can also cause impact damage to critical surfaces such as the horizontal stabiliser.
flowchart TD
S["Flight expected in suspected /
known ground icing conditions"]:::st
Q1{"Aircraft certificated &
equipped for icing?"}:::dec
Q2{"Operation at NIGHT?"}:::dec
N["Means to illuminate / detect
ice formation required
(no handicapping glare)"]:::warn
I["Inspect aircraft for icing"]:::ok
Q3{"Contamination present?"}:::dec
T["Apply appropriate
de-icing / anti-icing treatment"]:::ok
G["Aircraft in airworthy
condition → CLEARED to take off"]:::go
X["Do NOT operate"]:::stop
S --> Q1
Q1 -- No --> X
Q1 -- Yes --> Q2
Q2 -- Yes --> N --> I
Q2 -- No --> I
I --> Q3
Q3 -- Yes --> T --> G
Q3 -- No --> G
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classDef dec fill:#fdf3e0,stroke:#c8961e,color:#7a5708;
classDef ok fill:#eaf6ee,stroke:#3c9a5a,color:#1f5232;
classDef go fill:#3c9a5a,stroke:#1f5232,color:#fff;
classDef stop fill:#d9534f,stroke:#7d211d,color:#fff;
classDef warn fill:#fdecea,stroke:#d9534f,color:#7d211d;
There is no direct way to influence bird activity aloft. Therefore the only chance to minimise bird-strike risk in the air is to avoid flying through high bird concentrations. Away from the airfield, bird-strike prevention is most effectively conducted by warning procedures.
Hazardous bird concentrations are well known during migration periods on a large temporal and spatial scale, but also occur occasionally throughout the year on a local or regional scale, mainly governed by the diurnal cycle. The major aspects of handling the problem are monitoring, modelling, warning, predicting and forecasting — producing advice passed to the aviation community.
If, after take-off, you (as captain) notice a flock of birds presenting a strike hazard, you must immediately inform the appropriate ground station — not merely file a report on arrival, and not "within a reasonable period."
Noise abatement balances community quiet against flight safety. The golden principle: safety always overrides noise. Responsibility for establishing operating procedures for noise abatement during instrument flight (in compliance with ICAO PANS-OPS) rests with the operator — and the procedure specified for any one aeroplane type should be the same for all aerodromes.
Operating procedures for the departure climb must ensure flight safety is maintained while minimising noise exposure on the ground. The following requirements must be satisfied:
Noise abatement shall not be the determining factor in the designation of a runway under the following circumstances:
No ILS or visual guidance precludes a runway being used for noise-abatement procedures if landing in VMC. In other words, the absence of ILS/visual aids is what rules a runway out for noise abatement when landing visually.
"15 – 5 – Dry." Crosswind 15 kt, tailwind 5 kt, runway not dry — any one of these and noise abatement loses its vote on runway selection.
Fire-fighting strategy flows directly from one idea: a fire needs three things at once. Take any one away and the fire dies.
Combustion consists of three elements: oxygen, heat and fuel. Together these create a chemical chain reaction and result in a fire. The goal of fire-fighting is to eliminate at least one element from the fire in order to extinguish it.
| Class | Materials Involved | How To Extinguish | Smoke Characteristics |
|---|---|---|---|
| Class A | Wood, paper, cloth or plastic — solids, generally of organic nature. | Fires need to be cooled. Water extinguisher, or liquid with a large percentage of water (coffee, tea, juice) works. Water/glycol extinguishers are the most effective for Class A. Do NOT use liquid containing alcohol. | Usually gray/brown; can be quite thick depending on quantity of fuel. |
| Class B | Flammable liquid, hydraulic fluid, oil, tar or aircraft fuel — liquid or liquefiable solid. | Cannot be extinguished with water. Use Foam or Halon extinguishers. | Usually black; very thick, with a distinct oil/petrol-like odour. |
| Class C | Electrical equipment. | Must be extinguished with a non-conducting mixture to avoid electrocution and damage to circuitry. Halon extinguishers are effective. | Usually light grey or white, with a bluish tinge; very fine, disperses rapidly; distinct acrid odour. |
| Class D | Flammable metals — sodium, magnesium, lithium, potassium. | Special powder extinguishers only (avoids dangerous chemical reaction). Never use Halon on Class D. | — |
Hand-held fire extinguishers discharge an extinguishing agent for 8 to 25 seconds, depending on type and capacity. Because of this short period, it is essential to select and use the appropriate extinguisher immediately.
| Extinguisher Type | Colour Code | Suitable For |
|---|---|---|
| Halon / BCF (bromochlorodifluoromethane) | Green | Class A, B and C fires |
| Carbon dioxide (CO₂) | Black | Class B and C fires |
| Dry powder (DP) | Blue | Class D fires |
| Dry chemicals | Blue | Class A, B and C fires |
| Water solution (H₂O) | Red | Class A fires |
At least one Halon 1211 type extinguisher should be located on the flight deck. Galleys, personnel and cargo compartments should be equipped with proper extinguishers. Beneath fire extinguishers, the supporting fire-fighting equipment carried on board includes crash axes or crowbars.
ICAO Standards mandate the use of an alternative agent to Halon due to its impact on the environment — it depletes the ozone layer. As of now, Halon use is permitted only in cargo compartments till 28 Nov 2024.
| Maximum Approved Passenger Seating Configuration | Hand Extinguishers Required |
|---|---|
| 61 to 200 passengers | 3 conveniently located in the passenger compartment |
| 401 to 500 passengers | 6 conveniently located in the passenger compartment |
The kinetic energy lost in slowing an aircraft is converted by friction into heat. After a rejected take-off or a heavy landing, that heat is concentrated in the brakes and tyres — and it bites.
Overheated brakes can result in:
Brake failure — with subsequent poor directional control and deceleration — could in turn result in runway excursion, uncommanded ground movements / taxiway excursion, and collision with objects on the ground or other aircraft.
After a landing in overweight / overspeed conditions, with tyres and brakes extremely hot, the fireguards should approach the landing-gear tyres ONLY from front or rear side — never from the sides. A tyre that bursts releases its energy sideways; standing fore or aft keeps personnel out of the burst line. (Likewise: release the parking brake and approach the wheels either from aft or fore.)
Following a heavy-mass landing on a short runway, the first thing you should check is the temperature of the brakes.
Pressurisation keeps a survivable atmosphere around the cabin at cruising altitude. Losing it is one of the most time-critical emergencies in aviation — because the real enemy is hypoxia.
Cabin pressurisation is the pumping of compressed air into an aircraft cabin to maintain a safe and comfortable environment for crew and passengers when flying at altitude. Loss of pressurisation is a serious emergency in an aircraft flying at the high cruising altitudes typical of passenger aircraft.
Decompression occurring rapidly — at a rate greater than the rate the lungs can decompress — will cause lung damage. The likelihood of reaching a lung-damaging level, for any given pressure-hull breach size, is increased by the size of the pressure hull overall.
A decompression taking less than 0.5 seconds is considered by most authorities to be "explosive." The cabin air may fill with dust and debris, and fog forms from the associated drop in temperature and change in relative humidity. The crew may be momentarily dazed or shocked — especially if unexpected — and may therefore be slow to fit oxygen masks.
Slow decompression is similar to rapid decompression. The only difference is in severity and availability of reaction time. In both cases the actions by the crew remain the same. A slow decompression may be caused by a cracked window, a bad-functioning pressurisation system, or a minor leak in the fuselage — not by the loss of a whole door or window.
Fast decompression is recognised by: mist in the cabin, a blast towards the exterior of the aircraft, and expansion of body gases. "Mist in the cabin, pressure and temperature drop" characterise a fast depressurisation. During a slow depressurisation at cruise, the cabin rate-of-climb indicator shows a rate of climb.
The great danger of depressurisation is crew incapacitation due to hypoxia. Depending on aircraft altitude when depressurisation occurs, loss of pressurisation can very quickly incapacitate crew and passengers unless they receive supplementary oxygen. The Time of Useful Consciousness is reduced by the explosive nature of the decompression.
| Event | Cabin Altitude Trigger |
|---|---|
| Depressurization warning is required | When cabin altitude exceeds 10,000 ft |
| Passenger oxygen masks drop | When cabin altitude rises to between 13,200 ft and 14,000 ft — but no higher than 15,000 ft |
| Supplemental oxygen for pilots after emergency descent | Available for the entire flight time the cabin pressure altitude exceeds a minimum of 13,000 ft |
If the decompression is caused by structural failure (e.g. failure of a window), there is a risk of crew or passengers being buffeted by strong winds, hit by debris, exposed to extreme cold, or even being sucked out of the aircraft — another reason for wearing a seat belt or harness when seated.
flowchart TD
A["Explosive decompression detected
(e.g. at 31,000 ft)"]:::ev
B["1. Don oxygen masks
(crew oxygen FIRST)"]:::act
C["2. Initiate immediate
EMERGENCY DESCENT"]:::act
D["Descend to an altitude where
breathing without supplemental O2
is possible — approx 10,000 ft"]:::act
E["Pilots remain on O2 while cabin
pressure altitude exceeds 13,000 ft"]:::note
A --> B --> C --> D --> E
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classDef act fill:#eaf6ee,stroke:#3c9a5a,color:#1f5232;
classDef note fill:#e8f0fb,stroke:#2f6db0,color:#16365c;
On an explosive decompression at 31,000 ft, the initial action of the operating crew is to put on oxygen masks — before seatbelt signs and before the MAYDAY call. Note also: using the passenger oxygen system in severe cabin smoke is useless, because the drop-down masks are not sealed — the toxic cabin smoke mixes with the breathing oxygen. Supplemental oxygen's defined purpose is to provide people on board with oxygen during a cabin depressurisation.
Wind shear is a sudden change in wind — and because lift depends on airspeed, a sudden change in wind is a sudden change in performance. Close to the ground, in the approach, landing or take-off phase, that is a hazard with very little margin to recover.
Wind shear may be described as a change in wind direction and/or speed in space, including up-draughts and down-draughts. Intense down-draughts — typically associated with thunderstorms — produce strong vertical and horizontal wind-shear components hazardous to aircraft in the approach, landing or take-off phase. One of its main characteristics is that it can occur at any altitude, in both the vertical and horizontal planes.
| Criterion | Threshold |
|---|---|
| Vector magnitude | Exceeding 25 kts within 500 ft AGL |
| Vector magnitude | Exceeding 40 kts within 1 000 ft AGL |
| Vector magnitude | Exceeding 50 kts within 1 500 ft AGL |
| Pilot report of IAS loss or gain | 20 kts or more within 1 500 ft AGL |
A microburst is a small-scale, intense downdraft which, on reaching the surface, spreads outward from the down-flow centre. This causes both vertical and horizontal wind shear that can be extremely hazardous to all types and categories of aircraft, particularly within 1 000 ft AGL during approach to landing and in the take-off phases.
On take-off through a microburst, the aircraft first encounters a headwind (performance increasing), followed by a downdraft, then a tailwind (both performance decreasing). The initial headwind can fool the crew into a false sense of climb performance — moments before the tailwind/downdraft robs it.
| Characteristic | Detail |
|---|---|
| Size | Approximately 1 NM in diameter at 2 000 ft AGL, with a horizontal extent at the surface of approximately 2 to 2½ NM. |
| Intensity | Vertical winds as high as 6 000 ft/min. Horizontal winds giving as much as 45 KT at the surface (i.e. 90 KT shear). |
| Types | Normally accompanied by heavy rain in humid areas. In drier areas, falling raindrops may evaporate before reaching the ground — this is known as VIRGA. |
| Duration | Life-cycle seldom longer than 15 minutes; maximum-intensity winds last approximately 2–4 minutes. Concentrated into a line structure, activity may continue for as long as 1 hour. |
Once microburst activity starts, multiple microbursts in the same general area are common and should be expected. An aircraft entering the centre with a 40 kt headwind may, on crossing through, face a windshear of 80 kt (the headwind reverses into an equal tailwind).
The best defence against wind shear is to avoid it altogether — it could be beyond your or your aircraft's capabilities. However, should you recognise a wind-shear encounter, prompt action is required. In all aircraft the recovery could require:
When penetrating wind shear, the first magnitude to change value is Indicated Airspeed (IAS). During a landing approach with an increasing tailwind and no pilot action, the aircraft flies below the glide path and has a decreasing true airspeed. The amount of control action required to counter wind shear is substantial.
Every wing that produces lift also produces a wake. Behind a large aircraft, that wake is a pair of powerful, invisible "horizontal tornadoes" — and the separation tables exist to keep you out of them.
All airfoils produce a wake when producing lift. The higher-pressure air under the wing flows around the wingtip and tries to displace the lower-pressure (lower-energy) air on top. The greater the pressure differential, the stronger the flow around the wingtip. The air curling up around the wingtip forms a horizontal tornado that trails behind the airplane and tends to sink somewhat below the producing aircraft's flight path (in level flight).
Wake turbulence is created only when an airplane develops lift. It is greatest when the generating airplane is HEAVY, CLEAN and SLOW. In wake turbulence, the circulation of the vortex is outward, upward and around each wingtip.
"Heavy, Clean, Slow" — the three words that mean maximum wake. The most dangerous wind while landing or taking off behind a large aircraft is a light quartering tailwind.
| Category | MCTOW Criterion | Examples |
|---|---|---|
| Super Heavy (S) | Separate designation — currently only the Airbus A380-800, MCTOW 5,60,000 kg. | A380-800 |
| Heavy (H) | 136,000 kg MCTOW or more. | B777, B767, B747, B787, A300, A310, A330, A340, A350, DC-8, DC-10, MD-11, IL-86, IL-96, AN-225, L-1011 |
| Medium (M) | More than 7,000 kg and less than 136,000 kg MCTOW. | B727, B737, B757, A320, A321, Global Express, Challenger, CRJ, Fokker Friendship, Metro 4, BAe-146, Dash 8, ATR-72, Hercules, DC-3, Saab 340 |
| Light (L) | Less than 7,000 kg MCTOW. | Bandeirante, Metro 3, Cessna 402 & 421, Islander, Nomad, Piper Navajo, King Air Beech 99 |
The letter "L" is written in the wake-turbulence box of a flight-plan form when MCTOW is less than or equal to 7,000 kg.
| S.No. | Leading Aircraft | Following Aircraft | Separation Minima |
|---|---|---|---|
| 1 | A380-800 | MEDIUM | 3 Minutes |
| 2 | A380-800 | LIGHT | 4 Minutes |
| 3 | HEAVY | MEDIUM | 2 Minutes |
| 4 | HEAVY or MEDIUM | LIGHT | 3 Minutes |
| S.No. | Leading Aircraft | Following Aircraft | Separation Minima |
|---|---|---|---|
| 1 | A380-800 | Non A380-800 HEAVY | 2 Minutes |
| 2 | A380-800 | MEDIUM or LIGHT | 3 Minutes |
| 3 | HEAVY | LIGHT or MEDIUM | 2 Minutes |
| 4 | MEDIUM | LIGHT | 2 Minutes |
Departing-aircraft minima apply when aircraft use: (a) the same runway; (b) parallel runways separated by less than 760 m (2500 ft); (c) crossing runways if the projected flight path of the second aircraft will cross that of the first at the same altitude or less than 1000 ft below; (d) parallel runways separated by 760 m (2500 ft) or more, if the second aircraft's projected flight path will cross the first's at the same altitude or less than 1000 ft below.
| S.No. | Leading Aircraft | Following Aircraft | Separation Minima |
|---|---|---|---|
| 1 | A380-800 | MEDIUM or LIGHT | 4 Minutes |
| 2 | HEAVY | MEDIUM or LIGHT | 3 Minutes |
| 3 | MEDIUM | LIGHT | 3 Minutes |
| S.No. | Leading Aircraft | Following Aircraft | Separation Minima |
|---|---|---|---|
| 1 | A380-800 Arrival | LIGHT or MEDIUM | 3 Minutes |
| 2 | A380-800 Departure | LIGHT or MEDIUM | 3 Minutes |
| 3 | HEAVY Arrival | LIGHT or MEDIUM Departure | 2 Minutes |
| 4 | MEDIUM Arrival | LIGHT Departure | 2 Minutes |
| 5 | HEAVY Departure | LIGHT or MEDIUM Arrival | 2 Minutes |
| 6 | MEDIUM Departure | LIGHT Arrival | 2 Minutes |
Distance-based minima apply to aircraft provided with an ATS surveillance service in the approach and departure phases, where: (i) an aircraft is operating directly behind another at the same altitude or less than 1000 ft below; (ii) both use the same runway, or parallel runways separated by less than 760 m; or (iii) an aircraft is crossing behind another at the same altitude or less than 1000 ft below.
| Preceding Aircraft | Succeeding Aircraft | Distance-Based Separation Minima |
|---|---|---|
| A380-800 / Non A380-800 HEAVY | A380-800 | Not required + |
| A380-800 | Non A380-800 HEAVY | 6 NM * |
| MEDIUM | 7 NM * | |
| LIGHT | 8 NM * | |
| HEAVY | HEAVY | 5 NM * |
| MEDIUM | 5 NM * | |
| LIGHT | 6 NM * | |
| MEDIUM | HEAVY | Not required + |
| MEDIUM | Not required + | |
| LIGHT | 5 NM * | |
| LIGHT | HEAVY | Not required + |
| MEDIUM | Not required + | |
| LIGHT | Not required + |
+ — When a wake-turbulence restriction is not required, separation reverts to the prescribed radar separation minimum.
* — Where the prescribed radar separation minimum is more than the applicable wake-turbulence minimum, the prescribed radar separation minimum has precedence.
A separation minimum applies between a LIGHT or MEDIUM and a HEAVY aircraft, and between a LIGHT and a MEDIUM aircraft, when the heavier aircraft is making a low or missed approach and the lighter aircraft is landing on the same runway in the opposite direction (or on a parallel opposite-direction runway) separated by less than 760 m.
Where the lighter aircraft is instead utilising an opposite-direction runway for take-off, this minimum is 2 minutes.
Risk is highest when a heavy aircraft has just performed a take-off at a closely situated parallel runway with a light crosswind — the crosswind drifts the heavy's vortices onto your path.
Following an act of unlawful interference on board an aeroplane, the commander — or in his absence the operator — shall submit, without delay, a report of such an act to the designated local authority AND the Authority in the State of the operator.
In addition to informing each State whose citizens are known to be on board, the State of the country in which an aircraft has landed after an act of unlawful interference must immediately notify: the State of Registry of the aircraft, the State of the operator, and ICAO.
The Contracting State in which the unlawful interference occurs has the responsibility to take adequate measures for the safety of passengers and crew of an aircraft subjected to an act of unlawful interference, until their journey can be continued.
When a commercial transport passenger airplane is equipped with a flight-crew compartment door, that door must include a locking system to prevent any unauthorized access. The flight-deck door should be capable of being locked from within the compartment.
In case of a hi-jack, the transponder squawk code is 7500. When flight crew members are at their duty stations, they must keep the seat belts fastened.
| Term | Definition |
|---|---|
| Forced Landing | An immediate landing, on or off an airport, necessitated by the inability to continue further flight. Typical example — an airplane forced to land due to engine failure. |
| Precautionary Landing | A premeditated landing, on or off the airport, when further flight is possible but inadvisable. Examples — deteriorating weather, being lost, fuel shortage, gradually developing engine trouble. |
| Ditching | A forced or precautionary landing on water. |
Life jackets should NOT be inflated inside the aircraft — an inflated jacket can trap an occupant against the ceiling of a flooding cabin and block escape. They are inflated only on leaving the aeroplane.
An aircraft that must land far heavier than its maximum landing weight may dump fuel to get down to a safe landing mass. It is a controlled, coordinated procedure — not a panic action.
An aircraft in an emergency or other urgent situation may need to dump fuel so as to reduce to maximum landing weight, in order to effect a safe landing.
When an aircraft within controlled airspace requires to dump fuel, the flight crew shall advise ATC. The ATC unit should then coordinate with the flight crew:
Other known traffic should be separated from the aircraft dumping fuel by:
If the aircraft will maintain radio silence during fuel dumping, the frequency to be monitored and the time when radio silence will terminate should be agreed.
Requirements that must be shown to exist during fuel-jettisoning tests:
Fuel jettison should normally be carried out above 6,000 ft AGL — but it may be done anywhere if unavoidable.
More than half of the cargo carried by all modes of transport in the world is dangerous cargo — explosive, corrosive, flammable, toxic and even radioactive. These goods are essential for industrial, commercial, medical and research processes, and a great deal is carried by aircraft.
The following shall be forbidden on aircraft unless exempted by the States concerned:
When the runway is wet or contaminated, the friction available to stop the aircraft drops — and so does your safety margin. Knowing the exact definitions and the landing-distance factor is essential.
Runway surface friction is directly relevant to the braking action available to an aircraft decelerating after touchdown or after a decision to reject a take-off. Aircraft braking coefficient depends on the surface friction between the runway and the aircraft tyres — less friction means less braking coefficient and less braking.
For most multi-crew aircraft, anti-skid braking systems are fitted — these prevent wheel locking and allow more aggressive brake input on wet/slippery runways without inducing dynamic or viscous aquaplaning.
Braking efficiency is information presented as a combination of the terms: poor, medium, good.
| Condition | Definition |
|---|---|
| Damp | The surface is not dry, and surface moisture does not give a shiny appearance. |
| Wet | Covered with water (or loose/slushy snow) less than or equal to the equivalent of 3 mm of water; OR surface moisture is sufficient to make it reflective but does not create large stagnant sheets of water. |
| Contaminated | A runway covered with 4 mm thick water is said to be contaminated. |
An operator shall ensure that when weather reports/forecasts indicate the runway may be wet at the estimated time of arrival, the landing distance available is at least 115% of the required landing distance. Equivalently — if the flight manual gives no specific wet-runway data, the required landing distance on a dry runway must be increased by 15%.
Aquaplaning (also known as hydroplaning) is a condition that exists when landing on a surface with standing water deeper than the tread depth of the tyres. When the brakes are applied, the brake may lock up and the tyre rides on the surface of the water, much like a water ski.
When the tyres are hydroplaning, directional control and braking action are virtually impossible. An effective anti-skid system can minimize the effects of hydroplaning.
| Type | Primary Cause |
|---|---|
| Dynamic hydroplaning | Depends primarily on the depth of the standing water on the runway (and aeroplane speed along the runway lifting the tyre). |
| Viscous hydroplaning | Caused by a smooth and dirty runway surface. |
The effect whereby a tyre is lifted from the runway due to aeroplane speed along the runway is known as hydroplaning.
All 109 questions from the chapter are reproduced below. The correct option is highlighted green and marked ✓, with a one-line rationale. Cover the green boxes with a card to self-test, then reveal. A consolidated answer key grid follows at the very end.
1MMEL is drawn up by:
Why: The manufacturer drafts the Master MEL; the DGCA approves it.
2The Minimum Equipment List (MEL) is established by:
Why: The operator tailors the MMEL into its own MEL (DGCA-approved).
3A piece of equipment fails while still parked. The reference document used first to decide the procedure is:
Why: The MEL gives the go/no-go despatch decision for unserviceable items.
4The minimum equipment list of a public transport airplane is to be found in the:
Why: The operator includes the MEL in the Operations Manual.
5In public transport, prior to take-off in icing conditions, the captain must check that:
Why: Surfaces must be clean except for amounts the AFM specifically permits.
6Accumulation of snow or ice on an aircraft in flight induces an increase in the:
Why: Contamination destroys lift, so the wing stalls at a higher speed.
7Which requirement should be met when planning a flight with icing conditions:
Why: The aircraft must be certificated and equipped for icing conditions.
8As captain, after take-off you notice a flock of birds which may present a bird strike hazard. You must:
Why: Warning following traffic immediately is the only effective defence.
9What is the most effective method for scaring birds?
Why: Shell crackers are stated as the most effective scaring method.
1090% of bird strikes occur:
Why: The vast majority of strikes happen low, near the airfield.
11Birds on the ground ahead of an aircraft that has reached an average speed of 135 kt fly away:
Why: Studies show birds clear roughly two seconds before the aircraft.
12Who is responsible for establishing operating procedures for noise abatement during instrument flight in compliance with ICAO PANS-OPS?
Why: The operator specifies the noise-abatement procedure for each aeroplane type.
13About procedures for noise attenuation during landing:
Why: Only reverse thrust above reverse idle may be restricted — idle reverse is never fully prohibited.
14Noise abatement shall not be the determining factor in runway designation when: (1) crosswind incl. gust >15 kt; (2) tailwind incl. gust >5 kt; (3) runway not clear or dry. Correct combination:
Why: Any one of the three conditions removes noise abatement's say.
15In establishing noise preferential routes:
Why: Turning while reducing power compounds workload — it is avoided.
16What precludes a runway being used for noise abatement procedures if landing in VMC?
Why: Absence of ILS/visual guidance rules a runway out for VMC noise abatement.
17During a noise-abatement approach, the aeroplane is to be in the final landing configuration after passing the ___ or at a point ___ from the threshold, whichever is earlier:
Why: Stabilised by the outer marker or 5 NM — whichever comes first.
18In case of an engine nozzle fire while on ground you:
Why: Dry motoring blows out a residual fuel/nozzle fire on the ground.
19To extinguish a fire in the cockpit you use: (1) water; (2) powder/chemical; (3) halon; (4) CO₂. Correct combination:
Why: Halon and CO₂ are non-conducting and clean — safe around electrics.
20You will use a CO₂ fire-extinguisher for: (1) paper; (2) plastic; (3) hydrocarbon; (4) electrical. Correct combination:
Why: Per the bank, CO₂ is credited against all four fire types listed.
21You will use a dry chemical powder fire-extinguisher for: (1) paper; (2) plastic; (3) hydrocarbon; (4) electrical. Correct combination:
Why: Dry chemicals cover Class A, B and C fires.
22CO₂ type extinguishers are fit to fight: (1) Class A; (2) Class B; (3) electrical source; (4) special fires (metals, gas, chemical). Correct combination:
Why: CO₂ is unsuitable for special metal/chemical (Class D) fires.
23To fight a fire in an air-conditioned cargo hold:
Why: Killing ventilation starves the fire of oxygen.
24In case of a fire due to heating of the brakes, you fight the fire using: (1) dry powder; (2) water spray atomizer; (3) water extinguisher; (4) CO₂ to the maximum. Correct combination:
Why: Dry powder plus a water-spray atomizer cool a brake fire safely.
25A Class A fire is a fire of:
Why: Class A = wood, paper, cloth, plastic — ordinary solids.
26After landing, in case of high temperature of the brakes you:
Why: A bursting tyre throws energy sideways — stay fore/aft.
27H₂O extinguishers are fit to fight:
Why: Water cools Class A fires; it is dangerous on B and C.
28Fire-extinguisher types which may be used on Class B fires: (1) H₂O; (2) CO₂; (3) Dry-chemical; (4) Halogen. Correct combination:
Why: Class B (flammable liquid) cannot be fought with water.
29Fire-extinguisher types which may be used on Class A fires: (1) H₂O; (2) CO₂; (3) Dry-chemical; (4) Halogen. Correct combination:
Why: All four agents are credited against Class A fires.
30A dry-chemical type fire extinguisher is fit to fight: (1) Class A; (2) Class B; (3) electrical source; (4) special fires (metals, gas, chemicals). Correct combination:
Why: Per the bank, dry chemical is credited against all four.
31A fire occurs in a wheel and immediate action is required. The safest extinguishant to use is:
Why: Dry powder avoids thermal shock to the hot wheel/brake assembly.
32To use passengers' oxygen in case of severe cabin smoke is:
Why: Drop-down passenger masks are not sealed — they draw in cabin smoke.
33Following a heavy-mass landing on a short runway, you should check the:
Why: A heavy stop dumps huge kinetic energy as heat into the brakes.
34The correct statement about extinguishing agents on board aeroplanes is:
Why: Halon is highly effective — three times CO₂ for the same quantity.
35If smoke appears in the air conditioning, the first action to take is to:
Why: Protect the crew first — then diagnose and act.
36Beneath fire extinguishers, the following equipment for fire fighting is on board:
Why: Crash axes/crowbars allow access to hidden fires behind panels.
37A Class B fire is a fire of:
Why: Class B = flammable liquids, oil, fuel, hydraulic fluid.
38Fire fighting in the toilets must be performed with:
Why: A concealed lavatory fire demands maximum, immediate suppression.
39The system which must be switched off in case of a belly compartment fire is generally the:
Why: Cutting ventilation deprives the cargo fire of oxygen.
40You will use a water fire-extinguisher (straight jet) on a fire of: (1) solid (fabric, carpet); (2) liquids (ether, gasoline); (3) gas; (4) metals (sodium). Correct combination:
Why: A straight water jet suits only Class A solids.
41You will use a halon extinguisher for a fire of: (1) solids; (2) liquids; (3) gas; (4) metals. Correct combination:
Why: Halon covers A, B and C — never use it on metals (Class D).
42An engine fire warning will switch on the relevant fire shut-off handle. The fire shut-off handle will be switched off when:
Why: The warning extinguishes only once the fire detection clears.
43A 1211 halon fire-extinguisher can be used for: (1) paper; (2) fabric; (3) electric; (4) wood; (5) hydrocarbon. Correct combination:
Why: BCF/Halon 1211 is effective across Class A, B and C.
44A CO₂ fire extinguisher can be used for: (1) paper; (2) hydrocarbon; (3) fabric; (4) electrical; (5) wood. Correct combination:
Why: Per the bank, CO₂ is credited against all five listed items.
45A water fire-extinguisher can be used without restriction for: (1) paper; (2) hydrocarbon; (3) fabric; (4) electrical; (5) wood. Correct combination:
Why: Paper, fabric and wood are Class A — water's safe domain.
46After a landing with overweight and over-speed conditions, the fireguards should approach the landing-gear tyres:
Why: A tyre burst releases energy sideways — approach fore/aft.
47For a flight deck fire, which do you use? (1) BCF; (2) Halon; (3) Dry Powder; (4) Water.
Why: BCF/Halon are clean, non-conducting agents safe on the flight deck.
48An aircraft is configured for seating 61 to 200 passengers. The requirement for hand-held fire extinguishers is:
Why: 61–200 seats requires three conveniently located extinguishers.
49The number of hand fire extinguishers in the passenger compartment when seating configuration is between 401 and 500 is:
Why: 401–500 seats requires six conveniently located extinguishers.
50A water fire extinguisher with a directed spray can be used on which fires?
Why: Water targets Class A solids only.
51You will use a Halon extinguisher for a fire of: (1) solids; (2) liquids; (3) gas; (4) metals. Correct combination:
Why: Halon = Class A, B, C — never on metals (Class D).
52Fire extinguishers should be located in the pilots' compartment and…
Why: Each separate passenger compartment needs its own extinguisher.
53In case of an engine jet-pipe fire while on the ground you:
Why: Dry motoring blows the fire out without introducing more fuel.
54If cabin altitude increases during level flight, the differential pressure:
Why: Higher cabin altitude = lower cabin pressure = smaller differential.
55Minimum requirements for supplemental oxygen during/following an emergency descent: for pilots it shall be available for the entire flight time the cabin pressure altitude exceeds a minimum of X feet. X is:
Why: Pilots remain on oxygen whenever cabin altitude exceeds 13,000 ft.
56A slow decompression may be caused by:
Why: A small seal leak bleeds pressure slowly; a lost door is sudden.
57At FL290 in straight & level flight, a small leak causes a slow depressurisation. The cabin rate-of-climb indicator will show:
Why: Falling cabin pressure reads as a rising (climbing) cabin altitude.
58An aeroplane suffers explosive decompression at 31000 ft. The initial action by the operating crew is:
Why: Crew oxygen first — hypoxia incapacitates within seconds at altitude.
59A slow decompression may be caused by: (1) cracked window; (2) bad functioning of pressurization; (3) minor leak in fuselage; (4) loss of a door. Correct combination:
Why: Loss of a door is rapid/explosive, not slow.
60A fast decompression is recognizable by: (1) mist in the cabin; (2) blast towards the exterior; (3) expansion of body gases; (4) blast of air released violently from the lungs. Correct combination:
Why: All four are recognised signatures of a fast decompression.
61Supplemental oxygen is used to:
Why: Its purpose is preventing hypoxia during loss of pressurisation.
62Oxygen should be used after rapid decompression in an emergency descent until what altitude?
Why: 10,000 ft is the altitude at which oxygen is no longer required.
63In case of an unexpected encounter with windshear, you will: (1) set maximum take-off thrust; (2) increase pitch-up to the limit actuating the stick shaker; (3) pull in the drag devices (gear/flaps); (4) keep the airplane's current configuration; (5) reach maximum lift-to-drag ratio. Correct combination:
Why: Full power, max safe pitch, configuration unchanged — do not retract gear/flap.
64If you encounter a microburst just after taking off, at the beginning you will have: (1) head wind; (2) strong rear wind; (3) better climb performance; (4) diminution of climb gradient; (5) important thrust drop. Correct combination:
Why: The initial headwind momentarily improves climb performance.
65During a landing approach, the aircraft is subjected to windshear with an increasing tailwind. In the absence of pilot action, the aircraft: (1) flies above glide path; (2) flies below glide path; (3) increasing TAS; (4) decreasing TAS. Correct combination:
Why: Increasing tailwind robs airspeed — aircraft sinks below the glide path.
66To counter the effects of windshear, the amount of control action required is:
Why: Recovery may need full power and a near-stall pitch attitude.
67While approaching the outer marker, the tower informs you of a microburst. You will expect to encounter:
Why: A microburst produces both vertical and horizontal wind shear.
68One of the main characteristics of windshear is that it:
Why: Wind shear is not altitude- or plane-restricted.
69Which magnitude will be the first to change its value when penetrating a wind shear?
Why: A sudden wind change is felt first as an IAS change.
70An aircraft with a 40 kt headwind heading towards the centre of a microburst may expect, on crossing it, a windshear of:
Why: A 40 kt headwind reverses into a 40 kt tailwind — an 80 kt shear.
71When a commercial transport passenger airplane is equipped with a door in the flight-crew compartment area, this door must include:
Why: The flight-deck door must lock out unauthorised access.
72The State in which an aircraft has landed after an act of unlawful interference must immediately notify the:
Why: Registry State, operator State and ICAO must all be informed.
73In case of a hi-jack, the squawk code is:
Why: 7500 = unlawful interference; 7700 = general emergency; 7600 = radio failure.
74The flight deck door should be capable of being:
Why: Control of the lock stays with the flight crew, from inside.
75Who is responsible for adequate measures for the safety of passengers and crew of an aircraft subjected to unlawful interference until the journey can be continued?
Why: The State where the act occurs carries this responsibility.
76Following an act of unlawful interference, to whom should the commander submit a report?
Why: Report goes to the local authority AND the operator's State authority.
77When flight crew members are at their duty stations they must:
Why: Seat belts must stay fastened at the duty station.
78The State where an aircraft has landed after an act of unlawful interference must immediately notify the:
Why: Registry State, operator State and ICAO — the same trio as Q72.
79In case of ditching, the cabin attendants will: (1) evacuate women and children first; (2) have the passengers embark directly into the life rafts; (3) prevent passenger movements which may impede flotation; (4) ensure complete evacuation. Correct combination:
Why: Direct raft embarkation, controlled movement, and full evacuation.
80Mist in the cabin, pressure and temperature drop characterize:
Why: Sudden fog plus temperature drop are fast-decompression signatures.
81In the event of a precautionary landing, who is responsible for alerting the emergency services?
Why: A precautionary landing is premeditated — ATC alerts the emergency services.
82If ditching is inevitable:
Why: Brief life-jacket use beforehand; never inflate them inside the cabin.
83Requirements that must be shown to exist during fuel-jettisoning tests: (1) system free from fire hazard; (2) fuel discharges clear of any part of the aeroplane; (3) fuel fumes do not enter any part; (4) the jettison operation does not adversely affect controllability. Correct combination:
Why: All four conditions must be demonstrated during jettison tests.
84Fuel jettison should be carried out:
Why: Normally above 6,000 ft AGL — but anywhere if genuinely unavoidable.
85Fuel Jettison:
Why: Per the bank, fuel jettison is treated as an emergency-only mass reduction.
86A list of dangerous goods which may not be transported by air can be found in:
Why: The Technical Instructions list goods forbidden in normal circumstances.
87To carry hazardous materials on board a public transport airplane (per CAR-OPS), they must be accompanied with a:
Why: A hazardous-materials transport document must accompany the cargo.
88General information, instructions and recommendations on transport of hazardous materials are specified in the:
Why: The Operations Manual carries these instructions for the crew.
89Products are considered dangerous goods if defined as such by:
Why: The ICAO Technical Instructions are the defining reference.
90ICAO Appendix 18 is a document dealing with:
Why: Annex/Appendix 18 governs the safe transport of dangerous goods.
91The dangerous goods transport document, if required, shall be drawn up by:
Why: The shipper is responsible for the transport document.
92Can dangerous goods be carried in the passenger cabin or on the flight deck?
Why: Only goods the Technical Instructions specifically permit.
93The flight manual has no specific wet-runway data and reports indicate the runway may be wet. The required landing distance on a dry runway must be increased by:
Why: A wet runway requires at least 115% of the dry landing distance.
94A runway is considered damp when:
Why: Damp = not dry but no shine.
95A runway is considered wet when: (1) covered with water/loose-slushy snow ≤ 3 mm equivalent; (2) moisture modifies colour but not shiny; (3) moisture makes it reflective but no large stagnant sheets; (4) bears stagnant sheets of water. Correct combination:
Why: Wet = up to 3 mm or reflective — stagnant sheets mean flooded/contaminated.
96The presence of dynamic hydroplaning depends primarily on the:
Why: Standing water deeper than tread depth triggers dynamic hydroplaning.
97The braking efficiency is a piece of information presenting itself in the form of a:
Why: Braking action is reported as poor / medium / good.
98A runway covered with 4 mm thick water is said to be:
Why: More than 3 mm of water makes the runway contaminated.
99A runway is considered damp when:
Why: Damp is defined by the absence of shine, not a water depth.
100The effect whereby a tyre is lifted from the runway due to aeroplane speed along the runway is known as:
Why: Hydroplaning lifts the tyre onto a film of water.
101Viscous hydroplaning is caused by:
Why: A thin film on a smooth, dirty surface causes viscous hydroplaning.
102What is the shortest distance in a sequence for landing between a "Heavy" aircraft preceding a "Light" aircraft?
Why: Distance-based minimum for Heavy followed by Light is 6 NM.
103A separation minimum applies between a LIGHT/MEDIUM and a HEAVY (and between LIGHT and MEDIUM) when the heavier aircraft makes a low/missed approach and the lighter lands opposite-direction on the same or a parallel runway separated by:
Why: The trigger spacing is parallel runways less than 760 m apart.
104Same scenario, but the lighter aircraft is utilising an opposite-direction runway for take-off. This minimum is:
Why: A 2-minute minimum applies for the opposite-direction take-off case.
105To meet wake turbulence criteria, what minimum separation applies when a MEDIUM aircraft takes off behind a HEAVY aircraft, both using the same runway?
Why: Heavy leading, Medium following, same runway = 2 minutes.
106For arriving aircraft using timed approaches, what minima apply to an aircraft landing behind a heavy or medium aircraft?
Why: Arriving Heavy followed by Medium is 2 minutes (time-based table).
107What is the minimum wake turbulence separation when a LIGHT aircraft takes off behind a MEDIUM aircraft, both using the same runway?
Why: Medium leading, Light following, same runway = 2 minutes.
108The letter "L" is written in the wake-turbulence box of a flight-plan form when the MCTOW of an aircraft is less than or equal to:
Why: Light category = MCTOW of 7,000 kg or less.
109Wake turbulence risk is highest:
Why: A light crosswind drifts a heavy aircraft's vortices onto the parallel runway.
| Q | A | Q | A | Q | A | Q | A | Q | A | Q | A | Q | A |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | B | 17 | C | 33 | A | 49 | B | 65 | C | 81 | C | 97 | B |
| 2 | A | 18 | B | 34 | C | 50 | C | 66 | A | 82 | B | 98 | A |
| 3 | A | 19 | C | 35 | C | 51 | C | 67 | C | 83 | B | 99 | B |
| 4 | B | 20 | C | 36 | C | 52 | A | 68 | B | 84 | C | 100 | B |
| 5 | A | 21 | C | 37 | A | 53 | B | 69 | A | 85 | B | 101 | A |
| 6 | C | 22 | A | 38 | A | 54 | A | 70 | B | 86 | B | 102 | B |
| 7 | C | 23 | A | 39 | A | 55 | A | 71 | A | 87 | C | 103 | B |
| 8 | A | 24 | A | 40 | B | 56 | B | 72 | A | 88 | B | 104 | A |
| 9 | B | 25 | B | 41 | C | 57 | A | 73 | B | 89 | C | 105 | C |
| 10 | A | 26 | B | 42 | A | 58 | B | 74 | C | 90 | B | 106 | C |
| 11 | C | 27 | A | 43 | C | 59 | C | 75 | A | 91 | A | 107 | C |
| 12 | A | 28 | C | 44 | B | 60 | B | 76 | A | 92 | C | 108 | C |
| 13 | A | 29 | B | 45 | C | 61 | A | 77 | B | 93 | A | 109 | B |
| 14 | C | 30 | A | 46 | C | 62 | C | 78 | A | 94 | A | — | — |
| 15 | A | 31 | C | 47 | C | 63 | A | 79 | B | 95 | C | — | — |
| 16 | B | 32 | B | 48 | C | 64 | B | 80 | A | 96 | C | — | — |